KR100657745B1 - Pre-tensioned compression member - Google Patents

Abstract

A pre-tensioned compression member is provided to cut down construction cost, to enhance the appearance of a structure, and to make the best use of space by decreasing the sectional area of the compression member. A pre-tension assembly includes a couple of inner plates inserted to a compression member, combined with rotors(7) and provided with adjusting bolt holes, an upper plate(3) supporting an upper part of the inner plate, a lower plate(5) supporting a lower part of the inner plate, the rotor, a rotor guide(11) combined with the rotor to prevent displacement, and an adjusting unit regulating the initial curvature of the inner plate through the adjusting bolt hole, adjusting the distance of the inner plates and stabilizing the inner plate against compressive load. The adjusting unit comprises an adjusting bolt(13), an adjusting nut(17) and an adjusting washer(15).

Description

Cactus Compression Material {PRE-TENSIONED COMPRESSION MEMBER}

1 is a combined state of the cactus assembly that is installed inside the cactus compression material of the present invention.

2 is a view showing a cactus compress including the cactus assembly shown in FIG. 1.

3 is a view showing another embodiment of the present invention cactus compression material.

4 is a view showing a connection state between the cactus compression material shown in FIG.

5 is another embodiment of the cactus assembly interpolated to the present invention cactus compress.

Figure 6 is another embodiment of the cactus assembly interpolated in the present invention cactus compress.

7 is an embodiment of applying the cactus assembly shown in Figure 5 to the bearing wall.

<Description of the symbols for the main parts of the drawings>

1: inner plate 3, 3-1: top plate

5, 5-1: bottom plate 7: rotor

9: rotor groove 10: adjusting device

11: rotor guide 13: adjusting bolt

15: adjusting washer 17: adjusting nut

19: adjusting bolt hole 20: steel tube

21: connecting plate pocket 23: connecting plate

25: double curvature inner plate 27: triple curvature inner plate

30: bearing wall

The present invention relates to a structural system that improves compressive strength and buckling strength simultaneously by having cactus (pre-tension) in a steel compression material having a tube shape, and more particularly, has a curvature inside the compression material. Insert a number of plates or insert them in parallel with the length of the compressive material, compress the flat steel plates located at the top and bottom of the plate to a certain size, and then weld the two steel plates directly to the compressive material to make the compressive force consequently. The present invention relates to a cactus compress that simultaneously improves compressive strength, total buckling strength and local buckling strength.

Compression material means a member that receives mainly compressive force in a structure. Representative examples of such compressive materials include bridge piers, pillars of buildings, and bracing members. In addition, various tower-type structures and truss currents subjected to compressive force also belong to the category of compressive materials.

Generally, pure compressive force is rarely applied to the member supporting the upper structure, and in most cases, bending and compressive force act simultaneously. For this reason, the majority of structural members that resist the compressive force are beams. -Column).

The bollard is usually classified as a compressive member when the flexural force and the compressive force are performed simultaneously, but when the effect of the applied bending force is negligibly small compared with the compressive force.

In addition, the compression material is divided into Jangju, Jungju and Danju according to the three equipments.Jangju is a compression material with relatively large equipment, and the elastic buckling by Euler formula dominates the design strength. The yield of the member with the compressive material dominates its design strength.

On the other hand, in the case of mid-roads, which are commonly used in civil engineering and building structures, they are more complex. Based on the experimental results after theoretically derived considering the effects of compression imperfection (Initial Imperfection), inelastic behavior, and residual stress, The design strength is predicted and used by the modified design formula.

The design compressive strength of the column is generally influenced by the strength of the compression material rather than the yield strength of the steel. Therefore, for the economic design, the method of increasing the design compressive strength is mainly used for the economical design by estimating the cross section that minimizes the fine equipment.

However, the improvement of design economical efficiency by calculating the optimal cross section is not very effective, and there has been a steady demand for a method that can more effectively secure the design economics of Zhangzhou. As one of the most effective methods, one can think of ways to increase the elastic buckling load by Euler formula, but it is true that no specific ideas have been raised so far.

In the case of jungju and danju, steel with high yield strength is generally selected and used to secure design economy. This increases the design compressive strength through the use of steel with high yield strength. This is because the thickness can be reduced.

However, excessive reduction of steel plate thickness due to the use of steel with high yield strength can cause significant problems in the design of the compression material, which is local buckling.

Local buckling is a buckling phenomenon that occurs locally before the buckling of the whole compressive material occurs when the thickness of the steel subjected to the compressive force is thin. Such local buckling causes a drop in the load capacity of the entire compressive material, which is an important problem for the safety of the structure.

Another problem that arises in the design of quartets and shorts is that the maximum compressive strength of the compressive material is limited to within the yield strength of the steel.

In the case of a compressive material, especially in the case of a short cast, if the initial tensile strength can be applied to the member by a suitable method, the compressive material can withstand the load added beyond the yield strength by the initial tensile force, thereby designing a compressive force larger than the yield stress of the steel. You can expect strength. However, until now, the reality is that there are no examples specifically given how to apply the initial tensile force to the compressive material.

The present invention effectively improves the structural performance of compressive materials including long poles, middle poles, and short poles, thereby improving design economy and resisting larger design loads as compared with conventional compressive materials, as well as overall buckling strength and There is a technical problem to provide a compression structure system that enables the design of an economical cross section by increasing the local buckling strength.

The present invention relates to a cactus compress that improves both compressive strength, total buckling strength, and local buckling strength by having a cactus (pre-tension) in a steel compressive member having a tube shape for supporting a structure. Single or plural inner plates inserted into the ash, forming the initial curvature of the inner sheet and the contact between the inner sheet and the adjustment device for securing the structural stability of the inner sheet itself under a large compressive load, located on the top and bottom of the inner sheet The top plate and bottom plate to help the initial compressive force introduced into the plate, the rotor for the binding of the upper and lower plate and the inner plate and the free rotation of the inner plate end and the deviation of the position of the rotor in the upper and lower plate A cactus assembly is provided that includes a rotor guide to prevent this.

In addition, a cactus compress is formed by interpolating the cactus assembly into a steel tube.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a combined attitude of the cactus assembly installed in the interior of the cactus compression material of the present invention, Figure 2 is a view showing a cactus compression material comprising a cactus assembly, Figure 3 is a view showing another embodiment of the cactus compression material.

First, as shown in FIG. 1, the cactus assembly 100 according to the present embodiment has a pair of inner plate 1 and an upper plate 3 and a lower plate 5 in which an adjustment bolt hole 19 is formed at the center thereof. , Rotor 7, rotor guide 11, adjusting device 10.

The pair of inner plate 1 is located inside the compression member in a state in which the rotor 7 is fitted at both ends, and is installed through the adjustment bolt hole 19 formed in the center of the inner plate 1. The adjusting device 10 determines the initial curvature and the interval between the inner plate 1.

In addition, the upper plate (3) and the inside which supports the upper end of the inner plate 1, the rotor guide 11 is formed to prevent the rotor 7 of the inner plate (1) end is coupled and separated The bottom plate 5 supporting the lower end of the plate 1 and having the rotor guide 11 formed therein to prevent the rotor 7 of the inner plate end from being coupled and detached is combined with the inner plate 1, Cactus assembly 100 is to be formed.

Here, the adjusting device 10 is composed of an adjusting bolt 13, an adjusting nut 17, an adjusting washer 15, the adjusting bolt 13 passes through the adjusting bolt hole of the pair of inner plate (1). Position by adjusting the fitting washer 15 at both ends of the adjusting bolt 13, and then screwing the adjusting nut 17, so that the initial curvature of the inner plate (1) and the interval between the inner plate can be adjusted do.

FIG. 2 is a view showing a cactus compress including the cactus assembly 100 shown in FIG. 1, and inserting the cactus assembly 100 shown in FIG. 1 into the steel tube 20 as it is, and placing the bottom thereof. After the plate 5 is hardened by welding with the steel tube 20, an initial compressive force is applied to the cactus assembly 100 by pressing the upper plate 3 using equipment such as a hydraulic jack. When the initial compressive force of the desired size is introduced, the upper plate 3 is hardened by welding to the steel tube 20, resulting in giving the cactus to the compressed material. When the compression force is introduced, the adjusting bolt 13 helps to maintain the left and right symmetry of the deformation of the upper plate 3 and the lower plate 5 having an initial curvature and the pair of inner plates 1 as the initial compression force increases. To prevent structural changes into structural instability.

3 is a view showing another embodiment of the cactus compressive material, the cactus assembly 100 shown in FIG. 1 is inserted into the steel tube 20, and the bottom plate 5 is hardened by welding to the steel tube 20. When the upper plate 3 is pressed in the state where the rotor 7 is located in the corner formed by the upper plate 3 and the steel tube 20 meet to stably resist the initial compressive force. In this case, since the manufacture of the rotor guide 11 for preventing the positional deviation of the rotor 7 and helping the free rotation is unnecessary, it becomes possible to use the cactus assembly 300 shown in FIG.

4 is a view showing a connection state between the cactus compression material 300 shown in FIG. 3, in order to connect two or more cactus compression material 300 to each other, connecting plate pockets (top and bottom of the compression material 300) ( 21 is further formed, and by inserting the connecting plate 23 into the space formed by the connecting plate pocket 21, the upper and lower steel tube 20 is welded to connect the two or more cactus compression material 300 can be connected to use.

5 is a view showing another embodiment of the cactus assembly interpolated in the present invention cactus compression material, the cactus assembly shown in Figures 1 to 4 is composed of two inner plate (1), but is shown in Figure 5 The cactus assembly is characterized in that it consists of one inner plate 25 having a double curvature.

When using one inner plate 25 having a double curvature as described above, the processing and installation process of the adjustment bolt, the adjustment nut, the adjustment washer, and the adjustment bolt hole can be omitted, as shown in Figures 1 to 4 It is possible to produce a more economical cactus compression material than the cactus compression material.

At this time, in the case of using one inner plate member 25 having a double curvature, unlike the case of using two inner plate members, effective compressive force by the upper and lower end plates 3-1 and 5-1. Rotor guides 11 formed at both ends of the inner plate 25 and the upper and lower plates 3-1 and 5-1 for introduction may form a cactus assembly to be positioned at the center of the compressive material. It is preferable.

FIG. 6 is a view showing another embodiment of the cactus assembly shown in FIG. 5, wherein a cactus assembly composed of one inner plate 27 having triple curvature may be installed inside the compression member.

FIG. 7 is a view showing an embodiment in which the cactus assembly shown in FIG. 5 is applied to the bearing wall 30. By installing the inner plate 25 having a double curvature alternately inside the bearing wall 30, the upper structure is installed. It can function as a bearing wall that can effectively resist the compressive force transmitted from the surface load.

Here, the inner plate 25 having the double curvature is preferably configured as even as possible in order to introduce an effective compressive force.

As seen above, the cactus compressive material of the present invention enables the reduction of the cross-sectional area in the design of the compression member for supporting various civil and building structures, thereby improving the design and construction economics, the structure of the It not only improves aesthetics, but also makes it possible to utilize a wider space.

The technical idea of the cactus compressive material has been described above with the accompanying drawings, but this is by way of example only for describing the best embodiment of the present invention and not for limiting the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (8)

In the tube compression material produced using steel, A pair of inner plate members inserted in the lengthwise direction of the compression member, the rotor being fitted at both ends, and having an adjustment bolt hole formed at a center thereof; An adjusting device for forming an initial curvature of the inner plate by adjusting the hole of the adjustment bolt formed in the center of the pair of inner plate, adjusting the distance between the inner plate, and securing the structural stability of the inner plate resisting the compressive load; An upper plate supporting the upper ends of the pair of inner plate members and having a rotor guide to prevent the rotor of the inner plate ends being coupled and separated; And a bottom plate supporting a lower end of the inner plate, the lower plate having a rotor guide formed therein to prevent the rotor of the inner plate end being coupled and separated. The cactus assembly according to claim 1, wherein the adjusting device comprises an adjusting bolt, an adjusting nut, and an adjusting washer. The cactus compress according to claim 1, wherein the cactus assembly is formed by interpolating the inside of the steel tube. In the tube compression material produced using steel, A pair of inner plate members inserted in the lengthwise direction of the compression member, the rotor being fitted at both ends, and having an adjustment bolt hole formed at a center thereof; Through the adjustment bolt hole formed in the center of the pair of inner plate to form the initial curvature of the inner plate, adjust the distance between the inner plate, and to ensure the structural stability of the inner plate resisting the compressive load, An adjusting device composed of an adjusting nut and an adjusting washer; A top plate positioned on an upper portion of the pair of inner plates and supporting an upper end of the pair of inner plates; Located at the bottom of the pair of inner plate, the bottom plate for supporting the bottom of the pair of inner plate; constitute a cactus assembly, Compressing the cactus assembly into the interior of the steel tube, the cactus compression, characterized in that for placing the rotor of the inner plate in the inner corner portion formed by the steel tube (Tube) and the top plate, and the steel tube and the bottom plate ashes. According to claim 3 or claim 4, In order to connect two or more cactus compresses to each other, the connecting plate pocket is further formed at the upper and lower ends of the compressive material, and the connecting plate is inserted into the space formed by the connecting plate pocket. Cactus compression material, characterized in that by connecting the upper and lower steel tube by welding. The cactus compress according to claim 1 or 4, wherein the inner plate of the cactus assembly is composed of one inner plate having a double curvature. 7. The cactus compress according to claim 6, wherein the inner plate is made of one inner plate having a triple curvature. 7. The cactus bearing wall according to claim 6, wherein a plurality of inner plates having a double curvature are arranged to be staggered with each other.

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